Astronauts aboard the International Space Station vowed to double (and if necessary triple) check to ensure that the remaining tool bag they have is properly fastened during the next spacewalks today, after the other bag embarrassingly floated away into space earlier this week.

"We're definitely not going to do it again. You're not going to see us lose another bag," lead spacewalker Heidemarie Stefanyshyn-Piper told press.

Tuesday, on the first spacewalk of the two week mission, the bag holding Stefanyshyn-Piper’s tools floated out of a larger bag while the astronaut was cleaning grease from a leaking grease-gun. The bag, the size of a briefcase, had a two grease guns attached to it. The guns were used to lubricate a jammed joint on the space station’s rotating solar panels. The bag is one of the largest items to ever become orbital debris due to being lost by an astronaut. NASA estimated its cost at about $100,000.

The accident left only two grease guns in the possession of team comprised of Stefanyshyn-Piper, Stephen Bowen and Robert "Shane" Kimbrough

"We're going to double- and triple-check everything from here on out," Stefanyshyn-Piper said.

The spacewalk on Tuesday will be essentially the same as the first one, except that Stefanyshyn-Piper’s partner will be Kimbrough and not Bowen. The mission, occurring 220 miles above sea level, has cleaning and lubricating the problem joint as its objective. The spacewalkers will also relocate a railcar from the ISS’ exterior rail track and lubricate the station’s robotic arm. The mission schedule was modified because of the lost grease guns.

The ones that are left will be tethered to a larger bag to prevent them from leaking onto the other equipment. A dry wipe wrapped on the guns will catch any leaks. Also, Stefanyshyn-Piper will use a prelubricated wipe to clean the joint of metal shavings instead of a grease gun, in order to conserve grease.

"You've got to remember, we are working with humans here and we are prone to human error," said flight director Ginger Kerrick. "So we do the best we can and we learn from our mistakes."

Once the astronauts return to the station, they will celebrate the tenth anniversary of the International Space Station along with five other astronauts from the Endeavour, and the three permanent crew mates stationed on the ISS.

The astronauts will also run the first tests on a new water purification system that turns urine and sweat into drinking water. Much of Wednesday was spent by astronauts installing the thing. The contraption was shuttled up to the station along with the crew on the Endeavour, and so was other equipment which will allow the space station to accommodate three more crew members for a total of six and upscale the research operation on the station.